Abstract
The phytohormone abscisic acid (ABA) regulates plant growth and development as well as stress tolerance. The Arabidopsis sad1 (supersensitive to ABA and drought) mutation increases plant sensitivity to drought stress and ABA in seed germination, root growth, and the expression of some stress-responsive genes. sad1 plants are also defective in the positive feedback regulation of ABA biosynthesis genes by ABA and are impaired in drought stress induction of ABA biosynthesis. SAD1 encodes a polypeptide similar to multifunctional Sm-like snRNP proteins that are required for mRNA splicing, export, and degradation. These results suggest a critical role for mRNA metabolism in the control of ABA signaling as well as in the regulation of ABA homeostasis.
Publication types
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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Abscisic Acid / genetics
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Abscisic Acid / metabolism*
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Amino Acid Sequence
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Animals
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Arabidopsis / genetics
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Arabidopsis / physiology*
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Arabidopsis Proteins / chemistry
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Arabidopsis Proteins / genetics
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Arabidopsis Proteins / metabolism*
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Cold Temperature
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Gibberellins / pharmacology
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Glucose / pharmacology
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Homeostasis
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Humans
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Luciferases / genetics
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Luciferases / metabolism
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Molecular Sequence Data
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Mutation
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Plant Growth Regulators / genetics
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Plant Growth Regulators / metabolism
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Plant Structures / physiology
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Promoter Regions, Genetic
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RNA-Binding Proteins
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Recombinant Fusion Proteins / genetics
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Recombinant Fusion Proteins / metabolism
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Seeds / physiology
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Sequence Alignment
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Signal Transduction / physiology*
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Water-Electrolyte Balance
Substances
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Arabidopsis Proteins
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Gibberellins
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Plant Growth Regulators
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RNA-Binding Proteins
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Recombinant Fusion Proteins
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sad1 protein, Arabidopsis
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Abscisic Acid
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gibberellic acid
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Luciferases
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Glucose